Query last day, last week, last month SQLite

Question

I have this table in my Android SQLite DB:

CREATE TABLE statistics (subject TEXT, hits INTEGER, fails INTEGER, date DATE)

On date field is stored datetime('now', 'localtime') in every register.

Now I must query last day, last week and last month registers for showing some statistics. I've been trying something like this

    SELECT Timestamp, datetime('now', '-1 week') FROM statistics WHERE TimeStamp < datetime('now', '-1 week') 

and this

    SELECT * FROM statistics WHERE date BETWEEN datetime('now', localtime') AND datetime ( 'now', '-1 month')

and doesn't work :(

How can I do it?

Can I check if the query is OK by simply forwarding date in the virtual device emulator?

Thanks!

Answer 1

I have found this solution. I hope it works for you.

For last day:

SELECT * FROM statistics WHERE date BETWEEN datetime('now', 'start of day') AND datetime('now', 'localtime');

For last week:

SELECT * FROM statistics WHERE date BETWEEN datetime('now', '-6 days') AND datetime('now', 'localtime');

For last month:

SELECT * FROM statistics WHERE date BETWEEN datetime('now', 'start of month') AND datetime('now', 'localtime');

Answer 2

This code should get you the previous month

SELECT * 
FROM statistics 
WHERE date >= date('now','start of month','-1 month')
AND date < date('now','start of month')